Sorry to hear this, Opti.
My view is that you should be put back in the situation in which you found yourself before the incident at no expense to yourself. So, start making notes of the cost of every phone call, day off work, etc. that you take in order to resolve this.
Mrs. Opti might also be eligible for some compensation if her inability to sleep continues, so make notes of doctors' visits and outcomes, time off work, etc. I'm not normally one to ambulance chase in such a way, but if it turns out to have made her life a misery, then some funds for a holiday when it's all over might be welcome? That and the fact that you will doubtless find yourself out of pocket in some other way once all is said and done....
There really isn't any doubt as to who was responsible, so might be worth a solicitor's letter to the insurer responsible making it perfectly clear that your expectations are as above? They will stop the BS and start damage limitation when they realise you aren't going to go away.
Above all, it WILL get sorted out, so try to look beyond it all at this stage. I'm sure others with more recent experience
will be able to offer better words of advice than these, of course.